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Open Access Nano Express

Room-temperature nonequilibrium growth of controllable ZnO nanorod arrays

Qian Li, Kui Cheng, Wenjian Weng*, Chenlu Song, Piyi Du, Ge Shen and Gaorong Han

Author Affiliations

Department of Materials Science & Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, People's Republic of China

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Nanoscale Research Letters 2011, 6:477  doi:10.1186/1556-276X-6-477

Published: 27 July 2011

Abstract

In this study, controllable ZnO nanorod arrays were successfully synthesized on Si substrate at room temperature (approx. 25°C). The formation of controllable ZnO nanorod arrays has been investigated using growth media with different concentrations and molar ratios of Zn(NO3)2 to NaOH. Under such a nonequilibrium growth condition, the density and dimension of ZnO nanorod arrays were successfully adjusted through controlling the supersaturation degree, i.e., volume of growth medium. It was found that the wettability and electrowetting behaviors of ZnO nanorod arrays could be tuned through variations of nanorods density and length. Moreover, its field emission property was also optimized by changing the nanorods density and dimension.